BSB officially made the announcement Sunday during their concert at London's O2 Arena.

"I think we should let them in on the secret that we have. Since we love you guys so much, we are going to be back this year," Nick told the crowd, and Brian added, "And Kevin is coming back!"

The 40-year-old, who amicably departed from the group in June 2006 to pursue other interests, also confirmed the news via Twitter, posting, "Hello beau-ti-ful people. Yes, the cat is OFFICIALLY out of the bag. It's on and crackin!"